Gas range



4 SheetsrSheet 1 INVENTQRS F. w. RoBERTsHAW ET AL GAS RANGE Filed April 13. 1923 l l l l I l i I l l I I I A I I I l L F May 11 1926.

May 11 .1926. 1,584,400

F. W'. R'OBERTSHAW ET AL GAS RANGE 4- Sheets$het 2 Filed April 13. 1923 INVENTORS May 11', 1926.

F. W. ROBERTSHAW ET AL GAS RANGE 4 Sheets-Sheet 5 Filed April 15 F. w. ROBERTSHAW ET AL- GAS RANGE May 11 192s; 1,584,400

Filed April 15. 1923 4 Sheets-Sheet 4 zl fi' 3 Patented May 11,1926.

UNITED STATES v 1,584,400 PATENT OFF-ICE".

FREDERICK W. ROBERTSHAW, OF PITTSBURGH, AND GEORGE A. ROBERTSHAW, OF

I GBEENSBURG, PENNSYLVANIA. I

GAS RANGE.

Application filed April 13, 1923. Serial No. 631,8,25.

The present invention relates broadly to improvements in gas ranges, and more particularly to rangesof this character having a thermostat controlling the temperature of the oven. j

It is customary to construct gas ranges in such manner that a hot plate. is provided at one-end of the range and an oven at the other end. The front of the oven, the

outside end thereof, and thesplasher side, are usually either enameled, decorated, or of comparatively expensive material, making 1t undesirable to deface the same. This makes it comparatively difficult to effect the instal- 1 lation of a thermostat therein. This invention, however, provides an arrangement in which the thermostat is so installed that it is substantially concealed; the appearance of the oven is not injured; and the location of the thermostat is such that eflicient regulation is insured.

Vhile it-has heretofore been proposed to position thermostats within the oven, they have usually been so positioned as not to effeet accurate temperature regulation, or have required the presence of piping Within the oven. This inefficient regulation has been due in some instances tothe fact that thethermostat has been subjected directly to the heat of the fines rather than to the heat of the oven proper. Obviously, the presence of any piping within the oven is both objectionable and dangerous. By this inven tion, these objections are overcome.

The present application constitutes a continuation in part of our co-pending application Serial No. 459,360, filed Apr. 7, 1921.

1n the accompanying drawings, there is shown for purposes of illustration only, a preferred embodiment of this invention, it being understood that the drawings do not define the limitsof the invention, as changes may obviously be made in the construction disclosed therein without departing from the sp-irt of the invention or scope of our broader claims.

In the drawings,- Figure 1 is a top plan view of a range embodying the invention; Figure 2 is a front view of the construction shown in Figure 1;

Figure 3 is an end elevation of the range illustrated in Figures 1 and 2; g j Figure 4: is a detail sectional view, partly 25 in elevation and on an enlarged scale, illus-,

trating a portion of an oven having a thermostat positioned therein;

Figure 5 is a transverse sectional view on the line VV of Figure 4; v Figure 6; is a detail view of the dial and adjusting end of the thermostat;

Figure 7 is a; piping diagram showing the manner of installing the thermostat;

Figure 8 is a sectional view on an enlarged scale on the line VIIIVIII of Figure .t;

Figure 9 is a transverse sectional view on an enlarged scale on the line IX-IX of -Figure 8; and

Figure 10 1s a detail view of the oven manifold and the piping therefor.

1n gas ranges as ordinarily constructed at the present time, there is provided a hot plate 2 adjacent one end thereof, having the usual warming hood 3 and provided with an oven a adjacent the opposite end. Customarily, a burner manifold 5 extends in front of the hot plate for supplying gas to the individual burnermixing tubes 6. j

In order to eliminate entirely any piping I in front of the oven, we have found it highly desirable to supply the necessary gas for heating the oven directly from the manifold 5. For accomplishing this result, the manifold .5, as clearly shown in Figures 1 and 8, is tapped in one side thereof to receive the nipple 7 of the valve 8. The outlet of the valve is in turn connected through a short pipe section 9 and a union 10 with a gas pipe 11 leading to the rear of the range below the upper surface of the hot plate, whereby it is substantially concealed,

At the rear of the oven, a pipe 1.2 extends upwardly to a point adjacent the top of the oven, as. clearly shown in Figures 2, 3 and 7, and is then connected through a short horizontally extending section 1.3 with the lnlet side of a thermostatically controlled valve casing let.

\Vhile the specific construction of the thermostat and of the valve casing may be lid rear of the hot plate.

Any piping extending through these sheets not only 'defaees the oven and interferes with the installation or operation thereof, but if located on the splasher side, tends to collect grease and dirt. With this invention,

the sides 15, Y17 and 18 are kept intact, it

only being necessary to make a eompara tively small opening 19 in the backplate 20 of the oven. As this back plate is usually of ordinary sheet metal, it is atonce apparent that such an opening does not detract from the appearance of the oven.

The valve casing 14 is attached to the back plate 20 insuch manner that the projection 21 thereon extends through the opening 19. The location of the opening 19 is of considerable importance. In order that the ca is formed with vertically extending flues 22,

as shown, for example, in Figure 5, and an upper horizontally extending. flue 23. \Vithin these fines, and particularly within the vertically extending fines '22, the temperature is considerably higher than it is in other portions of the oven. This is due to the fact that the fines carry the heated air and products of combustion directly from the burner to the oven. If a thermostat is located in such manner that it is influenced by the heat within these flues rather than by the heat within the oven, we have found it impossible to effect temperature regulation within approximately 40. To overcome any such objections, the opening is posi-' tioned slightly to one side of and slightly below, the respective flues in one corner of the oven, whereby the thermostat 24: carried by the projection 21 will lie preferably in the upper right-hand corner of the oven, as indicated, extending from the rear of the oven to the front thereof.

Carried by the front end. of the thermostat 24, within the oven and adjacent the front end thereof, is a controlling or regulating device 25 cooperating with an indi eating .dial 26 whereby the thermostat may be easily set for any desired temperature. The expansion and'contraction of the thermostat is in turn effective through a gland pin 27 for opening or closing a valve 28 within the casing 14:- When the valve is open, gas will flow through the easing into the vertically extending connection 28 at the rear of the oven and thence through a short, horizontally extending pipe 29 to the Fromthis point, the gas may pass forwardy through a pipe 80 to a return U '81, illustrated iii-detail in Figure 10, extending upwardly at the plate adjacent the end of from view and installed without muti-lating the appearance of the oven. Also, it will be observed that there is no close pipe fitting, thereby enabling the piping connections to be easily made.

In many constructions it is desirable to provide the thermostatic" valve casing 14 with bypass connections 35 whereby a small amount of gas may continuously be supplied to the burnerfi. This supply may be provided for or not, in accordance with the demands of the. particular manufacturer. It s, however, necessary to provide a pilot to insure hghtmg of the gas after it has been cut off by the action of the thermostat. 1

This pilot may conveniently be in theform of a small tube 36, Figures 1 and 9, having connection with a valve nipple 37- threaded intoone Side of the pipe 11 leading to the thermostatic valve easing from the burner manifold. By reason of this location, it will be apparent that the pilot is automatically cut off each time the valve'8 is closed, and rendered operative each time the valve 8 is opened. It is not, however, aflected one way or the other by the, operation of the thermostat 24.

By positioning the thermostat within the oven, it will be apparent that it is necessary to open the oven door each time the thermostat is set. This setting, when first lighting the oven, is very desirable as it prevents the accumulation of any explosive mixture within the oven, such as. frequently results in considerable damage. Also,'in all cooking operations where two different temperatures are required, for effecting the cooking, it is essential that the higher temperature be used initially 'and the lower temperature used later. In a well construeted oven, the loss of heat is reduced to' a minimum, and in some constructions the oven will not cool in fifteen minutes. With our invention, however, it is necessary to-open the oven door to effect the resetting of the thermostat, and this'opening of the door will automaticallyhave the effect of expediting cooling of the oven. It will-be apparent that a separate key for controlling the setting may be provided, as the temperature of the operating parts within the oven would the handling thereof without such key undesirable.

This invention also provides an arrangement easily installed without any dlfliculties of pipe fitting, and in which the cost of the installation can be decreased by reason of the location of parts at'such points that expensive finishing operations are made unnecessary.

Further advantages arise from the location of the pilot in such position that it is not affected by the thermostat, and the location of the thermostat in such manner that it is subjected, to the desired temperature conditions within the oven.

We claim:

1. The combination with a gas oven having a burner supply pipe, ota valve for controlling the gas supply to .said pipe, said valve being located at the rear portion of the oven,'a thermostat for controlling said oven extending within the upper portion of said oven, and a setting device for the thermostat carried by'the thermostat and located at the forward portion of the oven,

substantially as described.

2. The combination with a gas oven having a burner supply pipe, of a valve for controlling the gas supply to said plpe, said valve being located at the rear portlon of the oven, a thermostat for controlling said oven extending within the upper portion of said oven, and a setting device for the thermostat located within and at the forward portion of the oven, substantially as described. I 7

3. The combination with a gas oven having a burner supply pipe, of a valve for controlling the gas supply to said pipe, sald valve being located at the rear portion of the oven, a thermostat located withinan upper corner of the oven and extending from the rear of the oven toward the front thereof for controlling said valve, and a setting device for the thermostat located at the forward portion of the oven, substantially as described.

4. In a gas range, a burner manifold, a hot plate supplied thereby, an oven, a burner therefor, a vertical loop of pipe at the back of the stove having one end connected with the manifold and the other end connected. with the burner, and a thermostatically controlled valve in the loop of pipe, substantially as described' 5. In afgas range, a burner manifold, a

'hot plate supplied thereby, an oven, a

burner therefor, a thermostatically controlled connection between said manifold and burner extending from the manifold to the back of the stove and then to the burner for controlling the supply of gas to the burner, and a manually controlled valve in said connection, substantially as described.

6. In a gas -range, a burner manifold, a hot plate supplied thereby, an oven, a burner for said oven, a connection between the manifold and burner for controlling the supply ward the front thereof, substantially as de-- scribed.

7. In a gas range,'a burner"manifold, a hot plate supplied thereby, an oven, a burner for said oven, a connection between the manifold and burner for controlling the supply of gas to the burner, a valve in said connection, and a thermostat operatively connected to said valve, said thermostat extending through the rear of the oven toward the front thereof, and located in one of the upper corners of the oven and spaced from the side and top thereof, whereby it is subjected to the true temperature conditions Within the oven, substantially as described.

8. In a gas range, a burner manifold, a hot plate supplied thereby, an oven, a burner 'for said oven, a mixing tube for said burner,

a thermostatically controlled valve on the rear of said oven, a connection leading from said manifold to said valve, a second connection leading from said valve to apoint adjacent the manifold, and a return U for said second connection adapted to slip into said mixing tube, substantially as described.

9. The combination. with a gas heated oven, of a burner therefor, a valve positioned on therear of said oven, a thermostat extending within the oven from the rear thereof for controlling the operation of. said" valve, a control cooperating with the front end of said thermostat and accessible upon opening the oven door, means for supplying gas to said valve, and a connection from said valve to said burner, substantially as described.

10. A thermostat attachment for stoves including a horizontal pipe, a vertical loop pipe having one end connected therewith, a thermostat-and valve atthe top of the vertical loop, and a second horizontal pipe connected with the other end of the loop, said loop beingin a plane at right angles to the horizontal pipe, substantially as described.

11. A thermostat attachment for stoves including a horizontal gas supply pipe, a second horizontal pipe for connection with a burner, a pair of vertically extending pipes having their lower ends connected with the respective horizontal pipes, and in a plane at right angles to the horizontal pipes, and a thermostat controlled valve connecting the two vertically extending pipes, substantially as described.

12. The combination with a stove having an oven, an oven burner arranged at one end of a hot plate with the oven burner at approximately the same level as the hot plate and havinga manifold through which gas is supplied to the hot plate, of a pipe extending from the manifold to the back of a operatively associated with the valve, substove, a loop of pipe in back of the oven stantially as described.

connected with the rear end of said first In testimony whereof we have hereunto 10 pipe, a pipe leading to the oven burner from set our hands.

the other end of sald loop, a thermostat controlled valve in thetop of the loop, and a FREDERICK W. ROBERTSHAW. thermostat in the upper part of the oven GEORGE A. ROBERTSHAW. 

